The formal servant has become the master

Xia was betrayed in her past life by the person she loved the most, she reincarnates into her favourite novel but that isn't half of the problem she encounters , the person who betrayed her, also reincarnates into the story , will she try to get revenge or will end up in a twisted romantic situation, or will everything just fall apart and she'll finally loose the sense of sanity she has been holding on to